US8310625B2ActiveUtilityPatentIndex 34

Liquid crystal display device

Assignee: FUJIWARA SAYURIPriority: May 18, 2007Filed: May 2, 2008Granted: Nov 13, 2012

Est. expiryMay 18, 2027(~0.9 yrs left)· nominal 20-yr term from priority

Inventors:FUJIWARA SAYURI MINOURA KIYOSHI SATOH EIJI ASAOKA YASUSHI

G02F 1/1334G02F 1/13718G02F 1/133553

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Claims

Abstract

A liquid crystal display device ( 100 ) according to the present invention includes: a scattering liquid crystal panel ( 110 ) including a scattering-type liquid crystal layer ( 140 ) which is capable of taking a transparent state; and a scattering state and a retroreflection plate ( 150 ). The scattering liquid crystal panel ( 110 ) before being combined with the retroreflection plate ( 150 ) satisfies the relationship of 0.45≦log(I 0-10 /I 20-30 )≦1.48, where, regarding light which enters through a rear face ( 110 b ) of the scattering liquid crystal panel ( 110 ) and goes out through a front face ( 110 a ), I 0-10 represents a mean value of scattering intensity of light which goes out at an angle in a range from 0 degrees to 10 degrees with respect to a normal direction of the front face ( 110 a ), and I 20-30 represents a mean value of scattering intensity of light which goes out in a range from 20 degrees to 30 degrees.

Claims

exact text as granted — not AI-modified

1. A liquid crystal display device comprising:
 a scattering liquid crystal panel including a scattering-type liquid crystal layer which is capable of taking a transparent state and a scattering state, the scattering liquid crystal panel having a front face and a rear face, the scattering liquid crystal panel satisfying the relationship of 0.45&lt;=log(I 0-10 /I 20-30 )&lt;=1.48, where, regarding light which enters through the rear face of the scattering liquid crystal panel and goes out through the front face when the scattering-type liquid crystal layer is in the scattering state, I 0-10  represents a mean value of scattering intensity of light which goes out at an angle in a range from 0 degrees to 10 degrees with respect to a normal direction of the front face, and I 20-30  represents a mean value of scattering intensity of light which goes out in a range from 20 degrees to 30 degrees; and 
 a retroreflection plate used in combination with the scattering liquid crystal panel, the retroreflection plate retroreflecting at least a portion of light which enters through the front face of the scattering liquid crystal panel and travels toward the rear face. 
 
     
     
       2. The liquid crystal display device of  claim 1 , wherein the scattering liquid crystal panel satisfies the relationship of 0.7≦log(I 0-10 /I 20-30 )≦1.4. 
     
     
       3. The liquid crystal display device of  claim 2 , wherein the scattering liquid crystal panel further includes a color filter. 
     
     
       4. The liquid crystal display device of  claim 1 , wherein a distance between the scattering-type liquid crystal layer and the retroreflection plate is no less than 30 μm and no more than 100 μm. 
     
     
       5. The liquid crystal display device of  claim 1 , wherein the retroreflection plate is attached on an outside of the scattering liquid crystal panel via a resin. 
     
     
       6. A method of producing a liquid crystal display device, comprising the steps of:
 providing a scattering liquid crystal panel including a scattering-type liquid crystal layer which is capable of taking a transparent state and a scattering state, the scattering liquid crystal panel having a front face and a rear face; 
 providing a retroreflection plate; and 
 combining the retroreflection plate with the scattering liquid crystal panel so that the retroreflection plate retroreflects at least a portion of light which enters through the front face of the scattering liquid crystal panel and travels toward the rear face, the method further comprising a step of: 
 before the retroreflection plate is combined with the scattering liquid crystal panel, determining whether the scattering liquid crystal panel satisfies the relationship of 0.45≦log(I 0-10 /I 20-30 )≦1.48, where, regarding light which enters through the rear face of the scattering liquid crystal panel and goes out through the front face when the scattering-type liquid crystal layer is in the scattering state, I 0-10  represents a mean value of scattering intensity of light which goes out at an angle in a range from 0 degrees to 10 degrees with respect to a normal direction of the front face, and I 20-30  represents a mean value of scattering intensity of light which goes out in a range from 20 degrees to 30 degrees. 
 
     
     
       7. The method of  claim 6 , comprising determining whether the scattering liquid crystal panel satisfies 0.7≦log (I 0-10 /I 20-30 )≦1.4. 
     
     
       8. The method of  claim 7 , wherein the scattering liquid crystal panel comprises a color filter. 
     
     
       9. The method of  claim 6 , wherein a distance between the scattering-type liquid crystal layer and the retroreflection plate is no less than 30 μm and no more than 100 μm. 
     
     
       10. The method of  claim 6 , wherein the retroreflection plate is attached to an outside of the scattering liquid crystal panel via a resin.

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